Connected: An Internet Encyclopedia
RFC 1700 - ip-xns-mapping

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    INTERNET / XNS PROTOCOL MAPPINGS

    Below are two tables describing the arrangement of protocol fields or
    type field assignments so that one could send XNS Datagrams on the
    MILNET or Internet Datagrams on 10Mb Ethernet, and also protocol and
    type fields so one could encapsulate each kind of Datagram in the
    other.

         \   upper| DoD IP |  PUP   | NS IP  |
    lower \       |        |        |        |
    --------------|--------|--------|--------|
                  |  Type  |  Type  |  Type  |
    3Mb Ethernet  |  1001  |  1000  |  3000  |
                  |  octal |  octal |  octal |
    --------------|--------|--------|--------|
                  |  Type  |  Type  |  Type  |
    10 Mb Ethernet|  0800  |  0200  |  0600  |
                  |   hex  |   hex  |   hex  |
    --------------|--------|--------|--------|
                  |  Link  |  Link  |  Link  |
    MILNET        |  155   |  152   |  150   |
                  | decimal| decimal| decimal|
    --------------|--------|--------|--------|

         \   upper| DoD IP |  PUP   | NS IP  |
    lower \       |        |        |        |
    --------------|--------|--------|--------|
                  |        |Protocol|Protocol|
    DoD IP        |   X    |   12   |   22   |
                  |        | decimal| decimal|
    --------------|--------|--------|--------|
                  |        |        |        |
    PUP           |   ?    |   X    |   ?    |
                  |        |        |        |
    --------------|--------|--------|--------|
                  |  Type  |  Type  |        |
    NS IP         |   13   |   12   |   X    |
                  | decimal| decimal|        |
    --------------|--------|--------|--------|

    []

Connected: An Internet Encyclopedia
RFC 1700 - ip-xns-mapping